Tyler Yahn 4014204d42 Allow multi-instrument callbacks to be unregistered (#3522) ... * Update Meter RegisterCallback method Return a Registration from the method that can be used by the caller to unregister their callback. Update documentation of the method to better explain expectations of use and implementation. * Update noop impl * Update global impl * Test global Unregister concurrent safe * Use a map to track reg in global impl * Update sdk impl * Use a list for global impl * Fix prom example * Lint metric/meter.go * Fix metric example * Placeholder for changelog * Update PR number in changelog * Update sdk/metric/pipeline.go Co-authored-by: Aaron Clawson <3766680+MadVikingGod@users.noreply.github.com> * Add test unregistered callback is not called Co-authored-by: Aaron Clawson <3766680+MadVikingGod@users.noreply.github.com>		2022-12-16 12:02:42 -08:00
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global	Allow multi-instrument callbacks to be unregistered (#3522)	2022-12-16 12:02:42 -08:00